Browsing by Author "Habibi-Yangjeh, Aziz"

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Anchoring Modified G-C3n4 With Bi5o7br: S-Scheme Photocatalysts With Boosted Activities in Elimination of Inorganic and Organic Pollutants
(Elsevier, 2023) Jalalat, Zahra; Habibi-Yangjeh, Aziz; Hemmati-Eslamlu, Paria; Akinay, Yuksel
In this research, modified g-C3N4 with hydrogen peroxide was decorated with Bi5O7Br nanoparticles (abbreviated as g-C3N4(M)/Bi5O7Br) via a facile precipitation procedure. The s-scheme g-C3N4(M)/Bi5O7Br (20 %) nanocomposite showed superior photocatalytic ability in degradation to tetracycline (TC), as a pharmaceutical pollutant, upon visible light. The maximal removal constant was 34.3 and 6.83-folds premier than g-C3N4 and g-C3N4 (M) systems, respectively. Interestingly, the g-C3N4(M)/Bi5O7Br (20 %) nanocomposite demonstrated excellent activity in visible-light elimination of amoxicillin (AMX) (an antibiotic), methyl orange (an anionic pollutant), rhodamine B and Fuchsine (cationic pollutants), and also photoconversion of Cr (VI) into Cr (III) upon visible light, that was about 15.5, 18.9, 22.4, 21.7, and 23.2-folds preferable than that of g-C3N4, respectively. The spectrophotometric, photoluminescence, and electrochemical studies approved the production of more charges upon visible light, and promoted segregation/movement of the generated charges within the binary g-C3N4(M)/Bi5O7Br (20 %) photocatalyst. The impressive segregation of charges was assigned to developing an s-scheme structure between Bi5O7Br and g-C3N4 (M) semiconductors. Scavenging tests revealed that superoxide anion radicals, holes, and hydroxide radicals were crucial species in the reactions. Eventually, the biocompatibility of the treated solution was confirmed via the successful growth of wheat seeds. In conclusion, the s-scheme g-C3N4(M)/Bi5O7Br system can be used as a suitable sample for environmental detoxification.
Facile Synthesis of Zno/Ceo2 Photocatalysts Sensitive To Visible Light With Tandem N-N Heterojunctions and Improved Performance Towards Tetracycline and Dye Effluent Removals
(Elsevier Science Sa, 2024) Andish-Lifshagerd, Fatemeh; Habibi-Yangjeh, Aziz; Habibi, Meysam; Akinay, Yuksel
Nowadays, ZnO-based photocatalysts are very effective in wastewater treatment. Herein, CeO2 and CeFeO3 nanoparticles were anchored on ZnO through a coprecipitation-calcination procedure. The fabricated materials were studied by TEM, EDX, SEM, XRD, HRTEM, XPS, PL, UV-vis DRS, BET, BJH, FTIR, and EIS analyses. The optimized ZnO/CeO2/CeFeO3 nanocomposite showed significant performance for the degradation of tetracycline hydrochloride, amoxicillin, Congo red, and Fuchsine with rate constants of 313 x 10-4 , 104 x 10-4 , 204 x 10-4 , and 163 x 10-4 min-1 , which was 24.1, 1.44, 20.4, and 2.03 times higher than ZnO, respectively. Moreover, the reduction of Cr(VI) to Cr(III) (189 x 10-4 min-1) over the ZnO/CeO2/CeFeO3 photocatalyst was almost 2.12 times faster than the ZnO photocatalyst (88.7 x 10-4 min-1). Besides, the photocatalyst presented remarkable stability after four cycles in the photodegradation of tetracycline hydrochloride contaminant. The purified solution over the photocatalyst was also tested in terms of biocompatibility. The optical, electrochemical, and textural analyses attributed the enhanced activity to the effective production and separation of charge carriers, facile transfer of electron/hole pairs, and promoted textural characteristics. The enhanced charge segregation was ascribed to the developing tandem n-n heterojunctions among ZnO, CeO2 , and CeFeO3.
Novel G-C3n4 Nanorods/Cu3bis3 Nanocomposites: Outstanding Photocatalysts With P-N Heterojunction for Impressively Detoxification of Water Under Visible Light
(Elsevier Science Sa, 2023) Hemmati-Eslamlu, Paria; Habibi-Yangjeh, Aziz; Akinay, Yuksel; Cetin, Tayfun
Novel g-C3N4 nanorods/Cu3BiS3 (abbreviated as R-GCN/Cu3BiS3) nanocomposites were fabricated via a facile hydrothermal procedure, and they were used for the removal of tetracycline (TC), amoxicillin (AMX), methyl orange (MO), rhodamine B (RhB), and Cr (VI) upon visible light. The XRD, EDX, XPS, and FTIR analyses affirmed anchoring Cu3BiS3 nanoparticles over the R-GCN component. An utmost amount of TC removal was gained when 30 wt% of Cu3BiS3 was anchored on R-GCN. The photoactivity of R-GCN/Cu3BiS3 (30%) nanocomposite for the removal of TC was 62.5 and 5.41-folds premier than GCN and T-GCN photocatalysts, respectively. The R-GCN/ Cu3BiS3 (30%) nanocomposite demonstrated significant activity even after four cycles of application. The anchored Cu3BiS3 component not only improved the extent of visible-light absorption, but also facilitated segregation and migration of charges, which were confirmed by UV-vis DRS, PL, EIS, and photocurrent analyses. Regarding the facile fabrication procedure, and outstanding activity, this research can be a good reference for construction of GCN-based visible-light-induced photocatalysts for treatment of various contaminants in wastewaters.
Qds-Sized Tio2-x/Bi12o15cl6 Photocatalysts With Tandem N-N Heterojunctions: Facile Fabrication and Impressive Visible-Light Photocatalytic Performances
(Elsevier, 2023) Jahed-Jaafargolikhanlo, Mahtab; Habibi-Yangjeh, Aziz; Pournemati, Khadijeh; Akinay, Yuksel
In the present study, we combined brown TiO2 (denoted as TiO2-x) with Bi12O15Cl6 and BiOCl components via a one-pot hydrothermal route preceded by calcination at 500 OC. The resultant novel photocatalyst was charac-terized by TEM, SEM, XRD, XPS, EDX, UV-vis DRS, FTIR, Raman, PL, photocurrent density, BET, and EIS ana-lyses. The quantum dots (QDs)-sized TiO2-x/Bi12O15Cl6/BiOCl nanocomposite exhibited a significant photocatalytic ability upon visible light for the photodegradation of tetracycline (TC) with the rate constant of 379 x 10-4 min-1, which was 28.3 and 9.92 times as high as pristine TiO2 and TiO2,-xrespectively. Moreover, compared with TiO2, the optimum photocatalyst presented boosted activity of 25.3 and 23.7 times in the deg-radations of rhodamine B and Fuchsine, and 23.0 folds in the reduction of Cr (IV) to Cr (III). The photo-luminescence, electrochemical, and textural analyses showed that the boosted activity of ternary TiO2-x/ Bi12O15Cl6/BiOCl photocatalyst is attributed to impressive separation and transfer of the photoinduced charges, and high surface area. The improved charge separation mechanism was devoted to developing tandem n-n heterojunctions amongst TiO2-x, Bi12O15Cl6, and BiOCl counterparts, as well as the construction of a QDs-sized photocatalyst. Moreover, the photocatalyst displayed considerable reusability in the TC degradation reaction. At last, the biocompatibility of the treated solution over the optimum TiO2-x/Bi12O15Cl6/BiOCl nanocomposite was proved by the growth of wheat seeds.